Erastus

"The fact that we stand upon one of the great and ancient mysteries of the world, sharing this pleasant conversation, means that you are a person of influence and power, and I want to make sure that your talents are harnessed appropriately. Shall we begin?"

 is a character in Tyranny.

Background
A master trainer who teaches Control Stone, Control Force, and use of the Magic Staff. Erastus is a deserter from the front, believed dead and lost in the Azure campaign. He used the new-found liberty to aid people, digging wells, clearing obstructions, and generally making use of his magical talents - one that didn't include merely hurling rocks around.